106 Transactions of the Royal Society of Victoria. 



The less coarse parts of this granite mass, though still 

 large in grain, is of such a texture that a fairly correct 

 estimate of its composition can be made by examining a thin 

 slice of good extent. 



I found in it muscovite in broad crystals, with irregularly 

 bounded planes parallel to the C axis. Some individuals 

 included grains of quartz. The felspar is in less amount, 

 being mainly orthoclase, with a smaller proportion of 

 plagioclase, which occurs in ill-formed crystals with irregular 

 twinning. The quartz is in large amount, and of the same 

 character as that spoken of before. In the mica, felspar, and 

 quartz there are numerous small spheroidal masses of black 

 opaque iron ore, which is probably of secondary origin. 

 This rock is, therefore, to be classed as a coarse-grained 

 muscovite granite. 



Another interesting exposure of the contact is laid open 

 in a gully somewhat nearer to the Hinnomunjie Morass. 

 Here the surface details are supplemented by a vertical 

 section in the banks of the gully immediately adjoining. 

 This exposure is, I think, a little to the eastward of the 

 general line of contact, if one may assume that at this spot it is 

 at the extreme western extremity of the masses of schist. But 

 the schists and the granites are so much interlocked that it 

 is not always safe in the absence of a detailed survey to 

 speak with certainty as to any particular spot in this line 

 being the main contact. The schists are here surprisingly 

 regular in their strike and dip considering their relation to 

 the granites. They are alternations of somewhat narrow 

 micaceous and quartzose beds. They are always at a high 

 angle of dip, and frequently vertical on a strike of near 

 N. 45° W. Fig. 2, Plate I., represents diagram m a tically the 

 relations of these schists, and of the granites which are in 

 contact with them. It will be seen that the granites have 

 come up as veins or dykes between the schist-beds, and that 

 at the principal contact these intrusive rocks are massive, 

 and fill a space which was once occupied by the schists which 

 are, as I have represented, cut off sharply, and in places are 

 more or less included in the intrusive rock. 



In proceeding across the strike of the schists, beyond the 

 line of section and in a north-easterly direction, the granite 

 veins decrease in number, and the schists are less altered, 

 until at perhaps a distance of a mile they have much the 

 normal appearance of the argillaceous schists of Keedy 

 Creek. 



